@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@300;400&family=Noto+Sans+JP:wght@300;400;500&display=swap');

:root {
  /* Design Tokens */
  --color-bg: #faf8f6;            /* Warm paper white */
  --color-text-primary: #121212;   /* Carbon charcoal */
  --color-text-secondary: #5e5d59; /* Soft dark grey */
  --color-text-muted: #9c9a96;     /* Muted grey */
  --color-border: #e6e3df;         /* Hairline layout border */
  --color-accent: #bc002d;         /* Crimson dot/focus */
  
  --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Consolas, Menlo, monospace;
  
  --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  
  --spacing-section: 120px;
}

/* Global Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.625;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Base Transition for Pages */
body {
  opacity: 0;
  animation: pageFadeIn 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pageFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Structure */
.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

@media (max-width: 768px) {
  .container {
    padding: 0 24px;
  }
  :root {
    --spacing-section: 80px;
  }
}

/* Header */
header {
  padding: 48px 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text-primary);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  transition: var(--transition-fast);
}

.logo:hover {
  opacity: 0.7;
}

nav {
  display: flex;
  align-items: center;
}

nav a {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-left: 40px;
  letter-spacing: 0.05em;
  position: relative;
  padding-bottom: 4px;
  transition: var(--transition-smooth);
}

nav a span {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-muted);
  margin-right: 6px;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-text-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

nav a:hover {
  color: var(--color-text-primary);
}

nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

nav a.active {
  color: var(--color-text-primary);
}

nav a.active::after {
  transform: scaleX(1);
}

@media (max-width: 680px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
    padding: 32px 0;
  }
  nav {
    width: 100%;
  }
  nav a {
    margin-left: 0;
    margin-right: 24px;
  }
}

/* Footer */
footer {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  padding: 48px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

footer a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
  border-bottom: 1px solid transparent;
}

footer a:hover {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-text-primary);
}

.footer-left {
  display: flex;
  gap: 24px;
}

@media (max-width: 600px) {
  footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 32px 0;
  }
  .footer-left {
    flex-direction: column;
    gap: 8px;
  }
}

/* Hero Component */
.hero {
  padding: 80px 0 60px 0;
  max-width: 820px;
}

.subtitle-japanese {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.25em;
  display: block;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 300;
  line-height: 1.35;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

@media (max-width: 768px) {
  .hero {
    padding: 48px 0 32px 0;
  }
  .hero h1 {
    font-size: 28px;
    line-height: 1.4;
  }
}

/* Featured Project Card */
.featured-project {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 80px;
  padding: 60px 0 var(--spacing-section) 0;
  border-top: 1px solid var(--color-border);
  align-items: center;
}

.featured-project .image-container {
  display: block;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background-color: #eae7e3;
  border: 1px solid var(--color-border);
}

.featured-project .image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1), filter 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.featured-project .image-container:hover img {
  transform: scale(1.03);
  filter: grayscale(0);
}

.featured-project .details {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.tag-active {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tag-active::before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.featured-project h2 {
  font-size: 32px;
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.featured-project .meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  display: flex;
  gap: 24px;
}

.featured-project p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
}

.btn-interactive {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  border: 1px solid var(--color-text-primary);
  transition: var(--transition-smooth);
  letter-spacing: 0.05em;
  background: transparent;
}

.btn-interactive svg {
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  stroke: var(--color-text-primary);
}

.btn-interactive:hover {
  background-color: var(--color-text-primary);
  color: var(--color-bg);
}

.btn-interactive:hover svg {
  transform: translateX(4px);
  stroke: var(--color-bg);
}

@media (max-width: 900px) {
  .featured-project {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 40px 0 var(--spacing-section) 0;
  }
  .featured-project h2 {
    font-size: 26px;
  }
}

/* Editorial layout (About) */
.editorial-layout {
  display: grid;
  grid-template-columns: 1fr 2.2fr;
  gap: 80px;
  padding: 60px 0 var(--spacing-section) 0;
}

.editorial-layout .sidebar h2 {
  font-size: 32px;
  font-weight: 300;
  line-height: 1.2;
  letter-spacing: -0.02em;
  position: sticky;
  top: 48px;
}

.editorial-layout .content-body {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.editorial-layout .content-body p {
  margin-bottom: 24px;
}

.editorial-layout .content-body .lead {
  font-size: 19px;
  font-weight: 300;
  color: var(--color-text-primary);
  line-height: 1.65;
  margin-bottom: 32px;
}

@media (max-width: 820px) {
  .editorial-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .editorial-layout .sidebar h2 {
    position: static;
  }
}

/* Taxonomy section */
.taxonomy-title {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.15em;
  margin-top: 48px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.taxonomy-grid {
  display: flex;
  flex-direction: column;
}

.taxonomy-item {
  display: grid;
  grid-template-columns: 1fr 2.2fr;
  gap: 80px;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.taxonomy-item .item-meta {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.taxonomy-item .item-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
}

.taxonomy-item h3 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.taxonomy-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

@media (max-width: 820px) {
  .taxonomy-item {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 24px 0;
  }
}

/* Projects Directory List */
.projects-dir {
  padding: 60px 0 var(--spacing-section) 0;
}

.projects-dir h2 {
  font-size: 28px;
  font-weight: 300;
  margin-bottom: 40px;
  letter-spacing: -0.01em;
}

.projects-table {
  display: flex;
  flex-direction: column;
}

.projects-header-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 0.5fr;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-text-primary);
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

.project-row {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 0.5fr;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: center;
  text-decoration: none;
  color: inherit;
  transition: var(--transition-smooth);
}

.project-row.active:hover {
  background-color: rgba(18, 18, 18, 0.02);
  border-bottom-color: var(--color-text-primary);
  padding-left: 16px;
  padding-right: 16px;
}

.projects-header-row .col-title {
  padding-right: 40px;
}

.project-row .p-title {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.01em;
  padding-right: 40px;
}

.project-row .p-sub {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: 2px;
  font-weight: 400;
}

.project-row .p-medium {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.project-row .p-region {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.project-row .p-year {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
  text-align: right;
}

.project-row.upcoming {
  opacity: 0.45;
  cursor: default;
}

.project-row.upcoming .p-medium {
  color: var(--color-text-muted);
}

@media (max-width: 960px) {
  .projects-header-row {
    grid-template-columns: 1.5fr 1fr;
  }
  .projects-header-row .col-region,
  .projects-header-row .col-year {
    display: none;
  }
  .project-row {
    grid-template-columns: 1.5fr 1fr;
  }
  .project-row .p-region,
  .project-row .p-year {
    display: none;
  }
}

/* Contact Page Layout */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 80px;
  padding: 60px 0 var(--spacing-section) 0;
}

.contact-info h2 {
  font-size: 36px;
  font-weight: 300;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.contact-info p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 40px;
}

.contact-methods {
  list-style: none;
  padding: 0;
}

.contact-methods li {
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.contact-methods a {
  color: var(--color-text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-text-muted);
  transition: var(--transition-fast);
  font-weight: 400;
}

.contact-methods a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-text-primary);
  outline: none;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  border-bottom-color: var(--color-text-primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-status {
  font-size: 14px;
  font-family: var(--font-mono);
  color: var(--color-text-secondary);
  min-height: 24px;
}

@media (max-width: 820px) {
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }
}

/* Language Switcher Styling */
.lang-switcher {
  display: flex;
  align-items: center;
  margin-left: 40px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-muted);
}

.lang-switcher .divider {
  margin: 0 6px;
  user-select: none;
  font-size: 10px;
  color: var(--color-border);
}

.lang-switcher .lang-btn {
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: 0 0 2px 0;
  border-bottom: 1px solid transparent;
  transition: var(--transition-fast);
}

.lang-switcher .lang-btn:hover {
  color: var(--color-text-primary);
}

.lang-switcher .lang-btn.active {
  color: var(--color-text-primary);
  font-weight: 600;
  border-bottom-color: var(--color-text-primary);
  pointer-events: none;
}

@media (max-width: 680px) {
  .lang-switcher {
    margin-left: 0;
    margin-top: 16px;
  }
}

.coming-soon-text {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 16px;
}